Process of making filaments for lighting and heating.



G. MICHAUD & E. DELASSON. PROCESS 0F MAKING IILAMENTS POR LIGHTING AND HEATING.

APPLICATION FILBDAAUG.18,19O5.

Patented Nov. 17, 1908.

L@ .I w M GEORGES MICHAUDAND EUGNE DELASSON, OF PARIS, FRANCE.

recense er einem@ riser-anims rontrefnirrue aan marmo.

Specification of Letters latent.V

Patented Nov. 1'?, 1908.

Application filed August 13, 1905. Serial No. 274,717,

To all whom it may concern.'

Be it known that we, Gnonen's MICHAUD and Encima Dniiasson, both citizens of the Republic of F rance, and residents of 6 Rue St. Laurent, Paris, `tizi/ance, have invented a lrocess of Making .liilament for Lighting and Heating, of which the following is a specification.

rl`his invention has for its object to provide an improved process of making a durable and refractory filament obtained by the fusion of magnesia, silica, or alumina. I

rEhe process consists generally in feeding suitable finely divided material and particularly y powdered alumina and-oxide of thorium, cerium'and chromium in a fine stream and arresting its movements in a zone of intense heat to agglomerate the same to produce a filament therefrom.

The process in its more specific details will be clearly set forth in the description of the operation of apparatus preferably employed vin making the filament.

ri"his filament is obtained by means of the apparatus hereinafter described or other. equivalent arrangement, in which the necessary conditions of fusion and of feed are fulfilled.

An apparatus which we have found to be particularly well adapted for carrying out our process is illustrated in the accompanying drawings, in which,

Figure l, is an elevation partly in section and Fig. 2, is a vertical section.

ln the drawings in which like letters of reference designate corresponding parts, a is an city-hydrogen blow-pipe surmounted by a feed reservoir b, provided with a suitable support (not shown). This reservoir contains the material to be used, either magnesia, silica. or alumina.. rllhe upper end of the main tube of the blow-pipe extends into the reservoir b and terminates in a tubular foraminous portion g preferably formed of woven wire through which the material contained in the reservoir is adapted to be forced or shaken.

Below the .blow-pipe is arranged a vertical screw threaded rod c, capable of moving up or down through a distance equal to the length of the filament, which is to be obtained. At the upper end of this screw c, is fitted a support d of alumina on which the llame of the blow-pipe a strikes, to effect the ent colors.

fusion of the material as the latter reaches it from the reservoir I).

The fall 01"' the material is produced by an electric vibrating striker c, which produces vibrations which compel the material, previously reduced to a fine powder, to flow through the openings in the tube g, down the central tube or' the blow-pipe and to fall in a fine thread upon the support al. There it fuses, and by causing the said support to m'ove downward in proportion to the amount of product made a' filament f is obtained the diameter of which is dependent upon the diameter of the opening 'of the tube-from which the material Hows.

To increase the hardness of the filaments, there may be added to the alumina, silica, or magnesia, a certain quantity of oxid of thorium, cerium, or other oxid of this series.

The light produced by the incandescence ot the Llaments obtained by the process above described may be coloredwith differ- This result is obtained by adding to the lime, silica, alumina, or magnesia used to form the filament different metallic oxids. More particularly there may be added oXid of chromium (sesquioxid), which is mixed with the material employed, in suitable proportion, for example 2% per cent. In this way there is obtained, by the addition of oXid of chromium a color which takes away from the mantles the somewhatgreen the filaments for electric lamps, there may' be added to the powdered materiall employed in producing the filaments a certain quantity of powdered vanadium, tantalium, osmium, or other metals of this series.

Having thus described our invention what we claim is,

1. A process of producing filaments from suitable material, which consists inV feeding the same in a nestream in the form of a powder and arresting its movement in a Zone of intense hea-t to agglomerate the saine, whereby a i'lament of the agglomerated material is precluded.

2. A process of roducing filaments frlom- `in a powdered state in a fine stream, 'in an Oxy-hydrogen flame and forming the fused material into aV-filament substantlally as descrilecl. 4

y 4. The process or' producing ilaments Which consists infnixing together alumina and oxicls of thorium, cerium and chromium, reducing this material to the form of a fine powder, fusing the saine in a fine stream and finally forming the fused, mass into a filament, substantially as described.

In testimony whereof. We aliX our signatures in presence of two Witnesses.

GEORGES MCHAUD. 'Y EUGNE DELASSGN. Vitnesses EMILE CoUCHoND, HANSON C. COKE. 

